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Digital computer , any of a class of devices capable of solving problems by processing information in discrete form. It operates on data, including magnitudes, letters, and symbols, that are expressed in binary code —i.

By counting, comparing, and manipulating these digits or their combinations according to a set of instructions held in its memory , a digital computer can perform such tasks as to control industrial processes and regulate the operations of machines; analyze and organize vast amounts of business data; and simulate the behaviour of dynamic systems e.

A brief treatment of digital computers follows. For full treatment, see computer science: Basic computer components. A typical digital computer system has four basic functional elements: 1 input-output equipment , 2 main memory , 3 control unit, and 4 arithmetic-logic unit. Any of a number of devices is used to enter data and program instructions into a computer and to gain access to the results of the processing operation.

Common input devices include keyboards and optical scanners; output devices include printers and monitors. The information received by a computer from its input unit is stored in the main memory or, if not for immediate use, in an auxiliary storage device.

The control unit selects and calls up instructions from the memory in appropriate sequence and relays the proper commands to the appropriate unit. It also synchronizes the varied operating speeds of the input and output devices to that of the arithmetic-logic unit ALU so as to ensure the proper movement of data through the entire computer system. The ALU performs the arithmetic and logic algorithms selected to process the incoming data at extremely high speeds—in many cases in nanoseconds billionths of a second.

The main memory, control unit, and ALU together make up the central processing unit CPU of most digital computer systems, while the input-output devices and auxiliary storage units constitute peripheral equipment. Blaise Pascal of France and Gottfried Wilhelm Leibniz of Germany invented mechanical digital calculating machines during the 17th century.

The English inventor Charles Babbage , however, is generally credited with having conceived the first automatic digital computer. During the s Babbage devised his so-called Analytical Engine , a mechanical device designed to combine basic arithmetic operations with decisions based on its own computations. For example, they called for sequential control—i.

Of great importance in the evolution of the digital computer was the work of the English mathematician and logician George Boole. In various essays written during the mids, Boole discussed the analogy between the symbols of algebra and those of logic as used to represent logical forms and syllogisms. His formalism, operating on only 0 and 1, became the basis of what is now called Boolean algebra , on which computer switching theory and procedures are grounded.

John V. Atanasoff , an American mathematician and physicist, is credited with building the first electronic digital computer , which he constructed from to with the assistance of his graduate student Clifford E. Konrad Zuse , a German engineer acting in virtual isolation from developments elsewhere, completed construction in of the first operational program-controlled calculating machine Z3.

In Howard Aiken and a group of engineers at International Business Machines IBM Corporation completed work on the Harvard Mark I , a machine whose data-processing operations were controlled primarily by electric relays switching devices. Since the development of the Harvard Mark I, the digital computer has evolved at a rapid pace.

The succession of advances in computer equipment, principally in logic circuitry, is often divided into generations, with each generation comprising a group of machines that share a common technology.

In J. Presper Eckert and John W. Mauchly , both of the University of Pennsylvania , constructed ENIAC an acronym for e lectronic n umerical i ntegrator a nd c omputer , a digital machine and the first general-purpose, electronic computer. The concept of a stored-program computer was introduced in the mids, and the idea of storing instruction codes as well as data in an electrically alterable memory was implemented in EDVAC e lectronic d iscrete v ariable a utomatic c omputer.

The second computer generation began in the late s, when digital machines using transistors became commercially available. Although this type of semiconductor device had been invented in , more than 10 years of developmental work was needed to render it a viable alternative to the vacuum tube.

The small size of the transistor, its greater reliability, and its relatively low power consumption made it vastly superior to the tube. Its use in computer circuitry permitted the manufacture of digital systems that were considerably more efficient, smaller, and faster than their first-generation ancestors. The first was the fabrication of the integrated circuit , a solid-state device containing hundreds of transistors, diodes , and resistors on a tiny silicon chip.

This microcircuit made possible the production of mainframe large-scale computers of higher operating speeds, capacity, and reliability at significantly lower cost.

Another type of third-generation computer that developed as a result of microelectronics was the minicomputer , a machine appreciably smaller than the standard mainframe but powerful enough to control the instruments of an entire scientific laboratory.

Such microcircuitry yielded two devices that revolutionized computer technology. The first of these was the microprocessor , which is an integrated circuit that contains all the arithmetic, logic, and control circuitry of a central processing unit. Its production resulted in the development of microcomputers , systems no larger than portable television sets yet with substantial computing power.

The other important device to emerge from LSI circuitry was the semiconductor memory. Consisting of only a few chips, this compact storage device is well suited for use in minicomputers and microcomputers.

Moreover, it has found use in an increasing number of mainframes, particularly those designed for high-speed applications, because of its fast-access speed and large storage capacity. Such compact electronics led in the late s to the development of the personal computer , a digital computer small and inexpensive enough to be used by ordinary consumers.

By the beginning of the s integrated circuitry had advanced to very large-scale integration VLSI. This design and manufacturing technology greatly increased the circuit density of microprocessor, memory, and support chips—i. By the s some VLSI circuits contained more than 3 million transistors on a silicon chip less than 0. Many of the microcomputers produced during the s were equipped with a single chip on which circuits for processor, memory, and interface functions were integrated.

See also supercomputer. Computers became smaller and faster and were ubiquitous in the early 21st century in smartphones and later tablet computers. Digital computer. Article Media. Info Print Print. Table Of Contents. Submit Feedback. Thank you for your feedback. Introduction Functional elements Development of the digital computer. See Article History. Read More on This Topic. While Bush was working on analog computing at MIT, across town Harvard professor Howard Aiken was working with digital devices for calculation.

Get exclusive access to content from our First Edition with your subscription. Subscribe today. Learn More in these related Britannica articles:.

Computer science , the study of computers and computing, including their theoretical and algorithmic foundations, hardware and software, and their uses for processing information. The discipline of computer science includes the study of algorithms and data structures, computer and network design, modeling data and information processes, and artificial intelligence.

Computer science…. Starting in , he…. In contrast to analog computers, digital computers represent information in discrete form, generally as sequences of 0s and 1s binary digits, or bits. The modern era of digital computers began in the late s and early s in the United States, Britain, and….

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Good Laboratory Practices GLP under 21 CFR 58 applies to nonclinical laboratory studies safety studies that are intended to support applications for research and marketing permits including Investigational Device Exemption and Premarket Approval applications. Compliance with this part is intended to ensure the quality and integrity of safety data obtained from animal studies submitted to FDA. If information on nonclinical laboratory studies is provided in the IDE application as part of the report of prior investigations, a statement that all such studies have been conducted in compliance with applicable requirements in the good laboratory practice regulations in part 58 must be provided. If any study was not conducted in compliance with the GLP regulations, a brief statement of the reason for the noncompliance must be provided.

X6000 Server Spare Parts Catalog 03

In order to ensure safe and reliable operations, we provide a variety of control systems for ship operation, which features the latest electronics technology and computer applications. Since the establishment of company, we consistently have provided an integrated service from planning, designing, manufacturing of control panels, creating control logics and SCADA software, to the end of commissioning for the thermal power plant. We have the supply record for these systems and can use a variety of control systems, such as many brand of PLC programmable logic controls. The following features powerfully support the customer engineers.

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Digital computer , any of a class of devices capable of solving problems by processing information in discrete form. It operates on data, including magnitudes, letters, and symbols, that are expressed in binary code —i.

The following is a partial list of products, services, and subsidiaries of International Business Machines IBM Corporation and its predecessor corporations, beginning in the s. Several machines manufactured for the Astronomical Computing Bureau at Columbia University are included, as are some machines built only as demonstrations of IBM technology. These products and others are missing simply because no one has added them. IBM sometimes uses the same number for a system and for the principal component of that system. And different IBM divisions used the same model numbers; for example IBM 01 without context clues could be a reference to a keypunch or to IBM's first electric typewriter. Number sequence may not correspond to product development sequence. For example, the tabulator was an improved, modernized, IBM uses two naming structures for its modern hardware products. Products are normally given a three- or four-digit machine type and a model number it can be a mix of letters and numbers. A product may also have a marketing or brand name.

Windows SideShow

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The Residential Networking ResNet Program is the utility that provides a high-speed data connection to the campus network and the Internet for every student living in University-owned housing. The ResNet program has three Service Centers to serve you.

Original Design Manufacturers ODMs provide device manufacturers an accelerated path to launching products with pre-tested white-box solutions and form factor reference designs that have Alexa built-in. These qualified solutions are close to end products in design, functionality, and hands-free Alexa voice performance. The Samesay CK is a 2. It also features multi-room music using the included iLive mobile app. It features a 3-mic far-field array, dual band WiFi, Bluetooth, and optional 4G connectivity. The device has mAh rechargeable battery that provides four hours of playback time and can be charged with a standard microUSB cable. The BT is designed for enterprise users and integrates with Amazon Alexa for Business to allow deployment as a shared voice communication device in conference rooms or on users' desks. The Mono wireless home telephone with Alexa built-in adopts a distributed architecture using DECT wireless technology for communication between the handset and the base, which connects to a landline and the internet. Alexa functionality can be activated with the dedicated Alexa key on the handset, and includes Alexa Calling and Messaging, Alexa to Alexa calling, outbound Drop In, and Announcements.

Construction Services works for manufacturing facilities of food processing . Heating equipment installation services.

Residential Computer Network (ResNet)

ISIC is a standard classification of economic activities arranged so that entities can be classified according to the activity they carry out. The categories of ISIC at the most detailed level classes are delineated according to what is, in most countries, the customary combination of activities described in statistical units and considers the relative importance of the activities included in these classes. The groups and divisions, the successively broader levels of classification, combine the activities of producing units according to: similarities in the character of the goods and services produced, the uses to which the goods and services are put, and the inputs, process and technology of production. Wide use has been made of ISIC, both nationally and internationally, in classifying data according to kind of economic activity in the fields of production, employment, gross domestic product and other statistical areas. ISIC is a basic tool for studying economic phenomena, fostering international comparability of data, providing guidance for the development of national classifications and for promoting the development of sound national statistical systems. We develop international standards for better measurement of labour issues and enhanced international comparability; provide relevant, timely and comparable labour statistics; and help Member States develop and improve their labour statistics. ISIC Rev. See also.

Original Design Manufacturers

Windows SideShow is a technology developed by Microsoft and introduced in the Windows Vista operating system that is designed to provide information such as the number of unread e-mail messages or RSS feeds on a secondary display of a Windows-based device; displays may be integrated as part of a device itself or included as part of a separate component connected to a personal computer. SideShow has been discontinued as of Windows 8. Auxiliary displays were listed by Microsoft among other forms of information indicators for personal computers during the Windows Hardware Engineering Conference of In February , Microsoft announced that the first beta version of Windows Vista, then codenamed "Longhorn," would include support for the feature; a preliminary software development kit would also be released concurrently with the operating system. With Windows 7 Microsoft introduced multiple user support for gadgets, improved the reliability and resiliency of SideShow APIs for gadgets on multiple devices, improved asynchronous processing throughput , and updated the SideShow control panel experience with changes such as a more prominent link to settings and the introduction of tooltip descriptions for gadgets.

Medical devices & IVDs

There are companies classified in this industry in the USA with an estimated employment of 4, people. This image represents an activity or product found in this industry. Some of the leading and most notable companies are listed below.

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Conair is a global leading supplier of auxiliary equipment and solutions for plastics processors. Our project services team is available to help you months before ground breaks, to assist with a plant and system layout that increases efficiency. Our sales team will work with the project services team to make sure that you have the equipment you need, perfectly sized, and on time. Our installation team can be there when the equipment arrives, to get you up and running at the earliest possible date.

Molded case circuit breakers up to A. With its convenient design, it can easily accommodate applications from 16 to A. Available with integrated earth leakage protection.

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